共查询到20条相似文献,搜索用时 62 毫秒
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论工科高校设置业余无线电台的积极意义山东工业大学王兆麟自从我国于1992年恢复业余无线电台的活动以来,仅一年时间,中国无线电运动协会就发展了2000多名新会员,全国各地的若干个集体业余无线电台和个人业余无线电台也相继设立,与之相关的各种活动也积极地开... 相似文献
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2013年1月,我国《业余无线电台管理办法》(以下简称《办法》)施行.新《办法》是我国业余无线电历史发展过程中,一个具有里程碑意义的管理制度,它将对我国业余无线电发展产生极大的深远影响.
1.《 办法》是业余无线电管理规章历史发展成果
1928年7月制定出台的《中华民国无线电管理条例》明确了无线电台的管理,但未明确业余无线电台的管理.1946年11月,原中国业余无线电协会制定发布的《中国业余无线电设置暂行规则》规定:"本暂行规则俟交通部颁布业余无线电台管理规则后即废止所有全国业余电台由交通部管理之."至1949年,政府未制定有关行政管理的规定. 相似文献
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上海市2013年第4次业余无线电台操作技术能力A类考试于12月15日开考,本期参加考试人员共101名,安排5个考场,参考人员中有1名为视力残障人士。 相似文献
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11月5日,工业和信息化部公布了《业余无线电台管理办法》(工业和信息化部令第22号,以下简称《办法》),并将于2013年1月1日起实施。《办法》是有关业余无线电台管理的专门性法规,对业余无线电台管理制度作了较为系统、细致和完善的规范,对《业余无线电台管理暂行规定》和《个人业余无线电台管理暂行办法》确定的无线电台管理制度作了较大调整。 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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罗晓羽 《信息技术与标准化》2008,(6):37-39
论述了推进电子行业标准制修订项目计划管理信息化的必要性.并提出了具体措施;详细介绍了电子行业标准制修订项目计划管理数据库的设计思路和实现方法.阐述了对后续工作的几点思考. 相似文献
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对影响镍镀层内应力的因素做了介绍和分析,提出了对收缩应力的一种解释,提供了排除这些因素影响的方法,指出重视镀液的管理是减少各种影响内应力因素的主要办法。 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献